琅琊山电厂封闭式电缆连接的220 kV变压器不拆头预防性试验研究与实施
랑야산전엄봉폐식전람련접적220 kV변압기불탁두예방성시험연구여실시
Discussion and carrying out of precautious tests method on 220 kV transformer without removal of HV lead
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